/* 
 * Copyright (C) Dirk Husemann, Computer Science Department IV, 
 * 		 University of Erlangen-Nuremberg, Germany, 1990, 1991, 1992
 * Copyright (c) 1992, 1993
 *	The Regents of the University of California.  All rights reserved.
 * 
 * This code is derived from software contributed to Berkeley by
 * Dirk Husemann and the Computer Science Department (IV) of
 * the University of Erlangen-Nuremberg, Germany.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *	This product includes software developed by the University of
 *	California, Berkeley and its contributors.
 * 4. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 *	@(#)llc_var.h	8.2 (Berkeley) 2/9/95
 */

#ifdef __STDC__
/*
 * Forward structure declarations for function prototypes [sic].
 */
struct llc;
#endif

#define	NPAIDB_LINK	0

struct npaidbentry {
	union {
		/* MAC,DLSAP -> CONS */
		struct {
			struct llc_linkcb *NE_link;
			struct rtentry *NE_rt;
		} NE;
		/* SAP info for unconfigured incoming calls */
		struct {
			u_short SI_class;
#define LLC_CLASS_I	0x1
#define	LLC_CLASS_II	0x3
#define LLC_CLASS_III	0x4				/* Future */
#define LLC_CLASS_IV	0x7				/* Future */
			u_short SI_window;
			u_short SI_trace;
			u_short SI_xchxid;
			void (*SI_input) 
				__P((struct mbuf *));
			caddr_t (*SI_ctlinput) 
				__P((int, struct sockaddr *, caddr_t));
		} SI;
	} NESIun;
};
#define np_link                 NESIun.NE.NE_link
#define np_rt                   NESIun.NE.NE_rt
#define si_class                NESIun.SI.SI_class
#define si_window               NESIun.SI.SI_window
#define si_trace                NESIun.SI.SI_trace
#define si_xchxid               NESIun.SI.SI_xchxid
#define si_input                NESIun.SI.SI_input
#define si_ctlinput             NESIun.SI.SI_ctlinput

#define NPDL_SAPNETMASK 0x7e

/*
 * Definitions for accessing bitfields/bitslices inside
 * LLC2 headers
 */
struct bitslice {
	unsigned int bs_mask;
	unsigned int bs_shift;
};


#define	i_z	        0
#define	i_ns	        1
#define	i_pf	        0
#define	i_nr	        1
#define	s_oz            2
#define	s_selector	3
#define	s_pf            0
#define	s_nr            1
#define	u_bb            2
#define	u_select_other	3
#define	u_pf            4
#define	u_select	5
#define	f_vs            1
#define	f_cr            0
#define	f_vr            1
#define	f_wxyzv         6

#define	LLCGBITS(Arg, Index)	(((Arg) & llc_bitslice[(Index)].bs_mask) >> llc_bitslice[(Index)].bs_shift)
#define	LLCSBITS(Arg, Index, Val)	(Arg) |= (((Val) << llc_bitslice[(Index)].bs_shift) & llc_bitslice[(Index)].bs_mask)
#define	LLCCSBITS(Arg, Index, Val)	(Arg) = (((Val) << llc_bitslice[(Index)].bs_shift) & llc_bitslice[(Index)].bs_mask)

extern struct bitslice llc_bitslice[];

#define LLC_CMD         0
#define LLC_RSP         1
#define LLC_MAXCMDRSP   2

/*
 * LLC events --- These events may either be frames received from the
 *                remote LLC DSAP, request from the network layer user, 
 *                timer events from llc_timer(), or diagnostic events from
 *                llc_input().  
 */

/* LLC frame types */
#define LLCFT_INFO                       0 * LLC_MAXCMDRSP
#define LLCFT_RR                         1 * LLC_MAXCMDRSP
#define LLCFT_RNR                        2 * LLC_MAXCMDRSP
#define LLCFT_REJ                        3 * LLC_MAXCMDRSP
#define LLCFT_DM                         4 * LLC_MAXCMDRSP
#define LLCFT_SABME                      5 * LLC_MAXCMDRSP
#define LLCFT_DISC                       6 * LLC_MAXCMDRSP
#define LLCFT_UA                         7 * LLC_MAXCMDRSP
#define LLCFT_FRMR                       8 * LLC_MAXCMDRSP
#define LLCFT_UI                         9 * LLC_MAXCMDRSP
#define LLCFT_XID                       10 * LLC_MAXCMDRSP
#define LLCFT_TEST                      11 * LLC_MAXCMDRSP

/* LLC2 timer events */
#define LLC_ACK_TIMER_EXPIRED           12 * LLC_MAXCMDRSP
#define LLC_P_TIMER_EXPIRED             13 * LLC_MAXCMDRSP
#define LLC_REJ_TIMER_EXPIRED           14 * LLC_MAXCMDRSP
#define LLC_BUSY_TIMER_EXPIRED          15 * LLC_MAXCMDRSP

/* LLC2 diagnostic events */
#define LLC_INVALID_NR                  16 * LLC_MAXCMDRSP
#define LLC_INVALID_NS                  17 * LLC_MAXCMDRSP
#define LLC_BAD_PDU                     18 * LLC_MAXCMDRSP
#define LLC_LOCAL_BUSY_DETECTED         19 * LLC_MAXCMDRSP
#define LLC_LOCAL_BUSY_CLEARED          20 * LLC_MAXCMDRSP

/* Network layer user requests */
/* 
 * NL_CONNECT_REQUEST --- The user has requested that a data link connection
 *                        be established with a remote LLC DSAP.
 */
#define NL_CONNECT_REQUEST              21 * LLC_MAXCMDRSP
/* 
 * NL_CONNECT_RESPONSE --- The user has accepted the data link connection.
 */
#define NL_CONNECT_RESPONSE             22 * LLC_MAXCMDRSP
/* 
 * NL_RESET_REQUEST --- The user has requested that the data link with the
 *                      remote LLC DSAP be reset.
 */
#define NL_RESET_REQUEST                23 * LLC_MAXCMDRSP
/* 
 * NL_RESET_RESPONSE --- The user has accepted the reset of the data link
 *                       connection.
 */
#define NL_RESET_RESPONSE               24 * LLC_MAXCMDRSP
/* 
 * NL_DISCONNECT_REQUEST --- The user has requested that the data link
 *                           connection with remote LLC DSAP be terminated.
 */
#define NL_DISCONNECT_REQUEST           25 * LLC_MAXCMDRSP
/*
 * NL_DATA_REQUEST --- The user has requested that a data unit be sent ot the
 *                     remote LLC DSAP.
 */
#define NL_DATA_REQUEST                 26 * LLC_MAXCMDRSP
/*
 * NL_INITIATE_PF_CYCLE --- The local LLC wants to initiate a P/F cycle.
 */
#define NL_INITIATE_PF_CYCLE            27 * LLC_MAXCMDRSP
/*
 * NL_LOCAL_BUSY_DETECTED --- The local entity has encountered a busy condition
 */
#define NL_LOCAL_BUSY_DETECTED          28 * LLC_MAXCMDRSP

#define LLCFT_NONE                      255

/* return message from state handlers */

/*
 * LLC_CONNECT_INDICATION --- Inform the user that a connection has been
 *                            requested by a remote LLC SSAP.
 */
#define LLC_CONNECT_INDICATION      1
/*
 * LLC_CONNECT_CONFIRM --- The connection service component indicates that the
 *                         remote network entity has accepted the connection.
 */
#define LLC_CONNECT_CONFIRM         2
/*
 * LLC_DISCONNECT_INDICATION --- Inform the user that the remote network
 *                               entity has intiated disconnection of the data
 *                               link connection.
 */
#define LLC_DISCONNECT_INDICATION   3
/*
 * LLC_RESET_CONFIRM --- The connection service component indicates that the
 *                       remote network entity has accepted the reset.
 */
#define LLC_RESET_CONFIRM           4
/*
 * LLC_RESET_INDICATION_REMOTE --- The remote network entity or remote peer
 *                                 has initiated a reset of the data link
 *                                 connection.
 */
#define LLC_RESET_INDICATION_REMOTE 5
/*
 * LLC_RESET_INDICATION_LOCAL --- The local LLC has determined that the data
 *                                link connection is in need of
 *                                reinitialization.
 */
#define LLC_RESET_INDICATION_LOCAL  6
/*
 * LLC_FRMR_RECEIVED --- The local connection service component has received a
 *                       FRMR response PDU.
 */
#define LLC_FRMR_RECEIVED           7
/*
 * LLC_FRMR_SENT --- The local connection component has received an ivalid
 *                   PDU, and has sent a FRMR response PDU.
 */
#define LLC_FRMR_SENT               8
/*
 * LLC_DATA_INDICATION --- The connection service component passes the data
 *                         unit from the received I PDU to the user.
 */
#define LLC_DATA_INDICATION         9
/*
 * LLC_REMOTE_NOT_BUSY --- The remote LLC DSAP is no longer busy. The local
 *                         connection service component will now accept a
 *                         DATA_REQUEST.
 */
#define LLC_REMOTE_NOT_BUSY         10
/*
 * LLC_REMOTE_BUSY --- The remote LLC DSAP is busy. The local connection
 *                     service component will not accept a DATA_REQUEST.
 */
#define LLC_REMOTE_BUSY             11

/* Internal return code */
#define LLC_PASSITON                255

#define INFORMATION_CONTROL	0x00
#define SUPERVISORY_CONTROL	0x02
#define UNUMBERED_CONTROL 	0x03 
 
/*
 * Other necessary definitions
 */
 
#define LLC_MAX_SEQUENCE    128
#define LLC_MAX_WINDOW	    127
#define LLC_WINDOW_SIZE	    7

/*
 * Don't we love this one? CCITT likes to suck on bits 8=)
 */
#define NLHDRSIZEGUESS      3

/*
 * LLC control block
 */

struct llc_linkcb {
	struct llccb_q {
		struct llccb_q *q_forw;			/* admin chain */
		struct llccb_q *q_backw;
	} llcl_q;
	struct npaidbentry  	*llcl_sapinfo;		/* SAP information */
	struct sockaddr_dl 	llcl_addr;		/* link snpa address */
	struct rtentry 		*llcl_nlrt;		/* layer 3 -> LLC */
	struct rtentry		*llcl_llrt;		/* LLC -> layer 3 */
	struct ifnet            *llcl_if;           	/* our interface */
	caddr_t			llcl_nlnext;		/* cb for network layer */
	struct mbuf   	 	*llcl_writeqh;		/* Write queue head */
	struct mbuf    		*llcl_writeqt;		/* Write queue tail */
	struct mbuf    		**llcl_output_buffers;
	short                   llcl_timers[6];         /* timer array */
	long                    llcl_timerflags;        /* flags signalling running timers */
	int                     (*llcl_statehandler)
		__P((struct llc_linkcb *, struct llc *, int, int, int));
	int                     llcl_P_flag;
	int                     llcl_F_flag;
	int                     llcl_S_flag;
	int                     llcl_DATA_flag;
	int                     llcl_REMOTE_BUSY_flag;
	int                     llcl_DACTION_flag;      /* delayed action */
	int                     llcl_retry;
	/*
	 * The following components deal --- in one way or the other ---
	 * with the LLC2 window. Indicated by either [L] or [W] is the
	 * domain of the specific component:
	 *
	 *        [L]    The domain is 0--LLC_MAX_WINDOW
         *        [W]    The domain is 0--llcl_window
	 */
	short           	llcl_vr;                /* next to receive [L] */
	short           	llcl_vs;                /* next to send [L] */
	short           	llcl_nr_received;       /* next frame to b ack'd [L] */
	short                   llcl_freeslot;          /* next free slot [W] */
	short                   llcl_projvs;            /* V(S) associated with freeslot */
	short                   llcl_slotsfree;         /* free slots [W] */
	short           	llcl_window;            /* window size */
	/*
	 * In llcl_frmrinfo we jot down the last frmr info field, which we
	 * need to do as we need to be able to resend it in the ERROR state.
	 */
	struct frmrinfo         llcl_frmrinfo;          /* last FRMR info field */
};
#define llcl_frmr_pdu0          llcl_frmrinfo.rej_pdu_0
#define llcl_frmr_pdu1          llcl_frmrinfo.rej_pdu_1
#define llcl_frmr_control       llcl_frmrinfo.frmr_control
#define llcl_frmr_control_ext   llcl_frmrinfo.frmr_control_ext
#define llcl_frmr_cause         llcl_frmrinfo.frmr_cause

#define	LQNEXT(l)	(struct llc_linkcb *)((l)->llcl_q.q_forw)
#define	LQEMPTY		(llccb_q.q_forw == &llccb_q)
#define	LQFIRST		(struct llc_linkcb *)(llccb_q.q_forw)
#define LQVALID(l)	(!((struct llccb_q *)(l) == &llccb_q))

#define LLC_ENQUEUE(l, m) if ((l)->llcl_writeqh == NULL) { \
				(l)->llcl_writeqh = (m); \
				(l)->llcl_writeqt = (m); \
			} else { \
				(l)->llcl_writeqt->m_nextpkt = (m); \
				(l)->llcl_writeqt = (m); \
			}

#define LLC_DEQUEUE(l, m) if ((l)->llcl_writeqh == NULL) \
                                (m) = NULL; \
                          else { \
				(m) = (l)->llcl_writeqh; \
				(l)->llcl_writeqh = (l)->llcl_writeqh->m_nextpkt; \
			}

#define LLC_SETFRAME(l, m) { \
			        if ((l)->llcl_slotsfree > 0) { \
				        (l)->llcl_slotsfree--; \
					(l)->llcl_output_buffers[(l)->llcl_freeslot] = (m); \
					(l)->llcl_freeslot = ((l)->llcl_freeslot+1) % (l)->llcl_window; \
					LLC_INC((l)->llcl_projvs); \
				} \
		           }

/*
 * handling of sockaddr_dl's
 */

#define LLADDRLEN(s) 	((s)->sdl_alen + (s)->sdl_nlen)
#define	LLSAPADDR(s) 	((s)->sdl_data[LLADDRLEN(s)-1] & 0xff)
#define LLSAPLOC(s, if) ((s)->sdl_nlen + (if)->if_addrlen)

struct sdl_hdr {
	struct sockaddr_dl sdlhdr_dst;
	struct sockaddr_dl sdlhdr_src;
	long sdlhdr_len;
};

#define LLC_GETHDR(f,m) { \
				struct mbuf *_m = (struct mbuf *) (m); \
				if (_m) { \
					M_PREPEND(_m, LLC_ISFRAMELEN, M_DONTWAIT); \
					bzero(mtod(_m, caddr_t), LLC_ISFRAMELEN); \
				} else { \
					MGETHDR (_m, M_DONTWAIT, MT_HEADER); \
					if (_m != NULL) { \
						_m->m_pkthdr.len = _m->m_len = LLC_UFRAMELEN; \
						_m->m_next = _m->m_act = NULL; \
						bzero(mtod(_m, caddr_t), LLC_UFRAMELEN); \
					} else return; \
				} \
				(m) = _m; \
				(f) = mtod(m, struct llc *); \
		      }

#define LLC_NEWSTATE(l, LLCstate) (l)->llcl_statehandler = llc_state_##LLCstate
#define LLC_STATEEQ(l, LLCstate) ((l)->llcl_statehandler == llc_state_##LLCstate ? 1 : 0)

#define LLC_ACK_SHIFT      0
#define LLC_P_SHIFT        1
#define LLC_BUSY_SHIFT     2
#define LLC_REJ_SHIFT      3
#define LLC_AGE_SHIFT      4
#define LLC_DACTION_SHIFT  5

#define LLC_TIMER_NOTRUNNING    0
#define LLC_TIMER_RUNNING       1
#define LLC_TIMER_EXPIRED       2

#define LLC_STARTTIMER(l, LLCtimer) { \
				 (l)->llcl_timers[LLC_##LLCtimer##_SHIFT] = llc_##LLCtimer##_timer; \
				 (l)->llcl_timerflags |= (1<<LLC_##LLCtimer##_SHIFT); \
				 }
#define LLC_STOPTIMER(l, LLCtimer) { \
				 (l)->llcl_timers[LLC_##LLCtimer##_SHIFT] = 0; \
				 (l)->llcl_timerflags &= ~(1<<LLC_##LLCtimer##_SHIFT); \
				 }
#define LLC_AGETIMER(l, LLCtimer) if ((l)->llcl_timers[LLC_##LLCtimer##_SHIFT] > 0) \
	                                  (l)->llcl_timers[LLC_##LLCtimer##_SHIFT]--;

#define LLC_TIMERXPIRED(l, LLCtimer) \
	(((l)->llcl_timerflags & (1<<LLC_##LLCtimer##_SHIFT)) ? \
	 (((l)->llcl_timers[LLC_##LLCtimer##_SHIFT] == 0 ) ? \
	  LLC_TIMER_EXPIRED : LLC_TIMER_RUNNING) : LLC_TIMER_NOTRUNNING)

#define FOR_ALL_LLC_TIMERS(t) for ((t) = LLC_ACK_SHIFT; (t) < LLC_AGE_SHIFT; (t)++)

#define LLC_SETFLAG(l, LLCflag, v) (l)->llcl_##LLCflag##_flag = (v)
#define LLC_GETFLAG(l, LLCflag) (l)->llcl_##LLCflag##_flag

#define LLC_RESETCOUNTER(l) { \
				      (l)->llcl_vs = (l)->llcl_vr = (l)->llcl_retry = 0; \
				      llc_resetwindow((l)); \
			      }

/*
 * LLC2 macro definitions
 */
				    

#define LLC_START_ACK_TIMER(l) LLC_STARTTIMER((l), ACK)
#define LLC_STOP_ACK_TIMER(l) LLC_STOPTIMER((l), ACK)
#define LLC_START_REJ_TIMER(l) LLC_STARTTIMER((l), REJ)
#define LLC_STOP_REJ_TIMER(l) LLC_STOPTIMER((l), REJ)
#define LLC_START_P_TIMER(l) { \
				      LLC_STARTTIMER((l), P); \
				      if (LLC_GETFLAG((l), P) == 0) \
					      (l)->llcl_retry = 0; \
				      LLC_SETFLAG((l), P, 1); \
			     }
#define LLC_STOP_P_TIMER(l) { \
				      LLC_STOPTIMER((l), P); \
				      LLC_SETFLAG((l), P, 0); \
			    }
#define LLC_STOP_ALL_TIMERS(l) { \
				      LLC_STOPTIMER((l), ACK); \
				      LLC_STOPTIMER((l), REJ); \
				      LLC_STOPTIMER((l), BUSY); \
				      LLC_STOPTIMER((l), P); \
			    }


#define LLC_INC(i) (i) = ((i)+1) % LLC_MAX_SEQUENCE

#define LLC_NR_VALID(l, nr)     ((l)->llcl_vs < (l)->llcl_nr_received ? \
	                             (((nr) >= (l)->llcl_nr_received) || \
	                              ((nr) <= (l)->llcl_vs) ? 1 : 0) : \
	                             (((nr) <= (l)->llcl_vs) && \
	                              ((nr) >= (l)->llcl_nr_received) ? 1 : 0))

#define LLC_UPDATE_P_FLAG(l, cr, pf) { \
			   if ((cr) == LLC_RSP && (pf) == 1) { \
			           LLC_SETFLAG((l), P, 0); \
				   LLC_STOPTIMER((l), P); \
			    } \
			    }

#define LLC_UPDATE_NR_RECEIVED(l, nr) { \
			    while ((l)->llcl_nr_received != (nr)) { \
				    struct mbuf *_m; \
				    register short seq; \
				    if (_m = (l)->llcl_output_buffers[seq = llc_seq2slot((l), (l)->llcl_nr_received)]) \
					    m_freem(_m); \
				    (l)->llcl_output_buffers[seq] = NULL; \
				    LLC_INC((l)->llcl_nr_received); \
				    (l)->llcl_slotsfree++; \
			    } \
			    (l)->llcl_retry = 0; \
			    if ((l)->llcl_slotsfree < (l)->llcl_window) { \
				    LLC_START_ACK_TIMER(l); \
			    } else LLC_STOP_ACK_TIMER(l); \
			    LLC_STARTTIMER((l), DACTION); \
			    }

#define LLC_SET_REMOTE_BUSY(l,a) { \
			    if (LLC_GETFLAG((l), REMOTE_BUSY) == 0) { \
				    LLC_SETFLAG((l), REMOTE_BUSY, 1); \
				    LLC_STARTTIMER((l), BUSY); \
				    (a) = LLC_REMOTE_BUSY; \
			    } else { \
				    (a) = 0; \
			    } \
			    }
#define LLC_CLEAR_REMOTE_BUSY(l,a) { \
			    if (LLC_GETFLAG((l), REMOTE_BUSY) == 1) { \
				    LLC_SETFLAG((l), REMOTE_BUSY, 1); \
				    LLC_STOPTIMER((l), BUSY); \
				    if (LLC_STATEEQ((l), NORMAL) || \
					LLC_STATEEQ((l), REJECT) || \
					LLC_STATEEQ((l), BUSY)) \
						llc_resend((l), LLC_CMD, 0); \
				    (a) = LLC_REMOTE_NOT_BUSY; \
			    } else { \
				    (a) = 0; \
			    } \
			    }

#define LLC_DACKCMD      0x1
#define LLC_DACKCMDPOLL  0x2
#define LLC_DACKRSP      0x3
#define LLC_DACKRSPFINAL 0x4

#define LLC_SENDACKNOWLEDGE(l, cmd, pf) { \
			   if ((cmd) == LLC_CMD) { \
				   LLC_SETFLAG((l), DACTION, ((pf) == 0 ? LLC_DACKCMD : LLC_DACKCMDPOLL)); \
			   } else { \
				   LLC_SETFLAG((l), DACTION, ((pf) == 0 ? LLC_DACKRSP : LLC_DACKRSPFINAL)); \
			   } \
		   }

#define LLC_FRMR_W     (1<<0)
#define LLC_FRMR_X     (1<<1)
#define LLC_FRMR_Y     (1<<2)
#define LLC_FRMR_Z     (1<<3)
#define LLC_FRMR_V     (1<<4)

#define LLC_SETFRMR(l, f, cr, c) { \
			   if ((f)->llc_control & 0x3) { \
				   (l)->llcl_frmr_pdu0 = (f)->llc_control; \
				   (l)->llcl_frmr_pdu1 = 0; \
			   } else { \
				   (l)->llcl_frmr_pdu0 = (f)->llc_control; \
				   (l)->llcl_frmr_pdu1 = (f)->llc_control_ext; \
			   } \
			   LLCCSBITS((l)->llcl_frmr_control, f_vs, (l)->llcl_vs); \
			   LLCCSBITS((l)->llcl_frmr_control_ext, f_cr, (cr)); \
			   LLCSBITS((l)->llcl_frmr_control_ext, f_vr, (l)->llcl_vr); \
			   LLCCSBITS((l)->llcl_frmr_cause, f_wxyzv, (c)); \
			}

/*
 * LLC tracing levels:
 *     LLCTR_INTERESTING        interesting event, we might care to know about
 *                              it, but then again, we might not ...
 *     LLCTR_SHOULDKNOW         we probably should know about this event
 *     LLCTR_URGENT             something has gone utterly wrong ...
 */
#define LLCTR_INTERESTING       1
#define LLCTR_SHOULDKNOW        2
#define LLCTR_URGENT            3

#ifdef LLCDEBUG
#define LLC_TRACE(lp, l, msg) llc_trace((lp), (l), (msg))
#else /* LLCDEBUG */
#define LLC_TRACE(lp, l, msg) /* NOOP */
#endif /* LLCDEBUG */
				      
#define LLC_N2_VALUE	  15              /* up to 15 retries */
#define LLC_ACK_TIMER     10              /*  5 secs */
#define LLC_P_TIMER        4              /*  2 secs */
#define LLC_BUSY_TIMER    12              /*  6 secs */
#define LLC_REJ_TIMER     12              /*  6 secs */
#define LLC_AGE_TIMER     40              /* 20 secs */
#define LLC_DACTION_TIMER  2              /*  1 secs */

#if defined (KERNEL) && defined(LLC)
extern int llc_n2;
extern int llc_ACK_timer;
extern int llc_P_timer;
extern int llc_REJ_timer;
extern int llc_BUSY_timer;
extern int llc_AGE_timer;
extern int llc_DACTION_timer;

extern int af_link_rts_init_done;

#define USES_AF_LINK_RTS { \
	if (!af_link_rts_init_done) { \
	       rn_inithead((void **)&rt_tables[AF_LINK], 32); \
	       af_link_rts_init_done++; \
	       } \
	 }

struct ifqueue llcintrq;

extern struct llccb_q llccb_q;
extern char *frame_names[];

/* 
 * Function prototypes
 */
int sdl_cmp __P((struct sockaddr_dl *, struct sockaddr_dl *));
int sdl_copy __P((struct sockaddr_dl *, struct sockaddr_dl *));
int sdl_swapaddr __P((struct sockaddr_dl *, struct sockaddr_dl *));
int sdl_checkaddrif __P((struct ifnet *, struct sockaddr_dl *));
int sdl_setaddrif __P((struct ifnet *, u_char *, u_char, u_char, 
		      struct sockaddr_dl *));
int sdl_sethdrif __P((struct ifnet *, u_char *, u_char, u_char *, u_char, u_char, 
		      struct sdl_hdr *));
struct npaidbentry *llc_setsapinfo __P((struct ifnet *, u_char, u_char,
					struct dllconfig *));
struct npaidbentry *llc_getsapinfo __P((u_char, struct ifnet *));
struct rtentry *npaidb_enrich __P((short, caddr_t, struct sockaddr_dl *));
int npaidb_destroy __P((struct rtentry *));
short llc_seq2slot __P((struct llc_linkcb *, short));
int llc_state_ADM __P((struct llc_linkcb *, struct llc *, int, int, int));
int llc_state_CONN __P((struct llc_linkcb *, struct llc *, int, int, int));
int llc_state_RESET_WAIT __P((struct llc_linkcb *, struct llc *, 
			      int, int, int));
int llc_state_RESET_CHECK __P((struct llc_linkcb *, struct llc *, 
			       int, int, int));
int llc_state_SETUP __P((struct llc_linkcb *, struct llc *, int, int, int));
int llc_state_RESET __P((struct llc_linkcb *, struct llc *, int, int, int));
int llc_state_D_CONN __P((struct llc_linkcb *, struct llc *, int, int, int));
int llc_state_ERROR __P((struct llc_linkcb *, struct llc *, int, int, int));
int llc_state_NBRAcore __P((struct llc_linkcb *, struct llc *, int, int, int));
int llc_state_NORMAL __P((struct llc_linkcb *, struct llc *, int, int, int));
int llc_state_BUSY __P((struct llc_linkcb *, struct llc *, int, int, int));
int llc_state_REJECT __P((struct llc_linkcb *, struct llc *, int, int, int));
int llc_state_AWAIT __P((struct llc_linkcb *, struct llc *, int, int, int));
int llc_state_AWAIT_BUSY __P((struct llc_linkcb *, struct llc *, int, int, int));
int llc_state_AWAIT_REJECT __P((struct llc_linkcb *, struct llc *, int, int, int));
int llc_statehandler __P((struct llc_linkcb *, struct llc *, int, int, int));
int llc_init __P((void));
struct llc_linkcb *llc_newlink __P((struct sockaddr_dl *, struct ifnet *, 
				    struct rtentry *, caddr_t, struct rtentry *));
int llc_dellink __P((struct llc_linkcb *));
int llc_anytimersup __P((struct llc_linkcb *));
char * llc_getstatename __P((struct llc_linkcb *));
void llc_link_dump __P((struct llc_linkcb *, const char *));
void llc_trace __P((struct llc_linkcb *, int, const char *));
void llc_resetwindow __P((struct llc_linkcb *));
int llc_decode __P((struct llc *, struct llc_linkcb *));
void llc_timer __P((void));
void llcintr __P((void));
int llc_input __P((struct llc_linkcb *, struct mbuf *, u_char));
caddr_t llc_ctlinput __P((int, struct sockaddr *, caddr_t));
int llc_output __P((struct llc_linkcb *, struct mbuf *));
void llc_start __P((struct llc_linkcb *));
int llc_send __P((struct llc_linkcb *, int, int, int));
int llc_resend __P((struct llc_linkcb *, int, int));
int llc_rawsend __P((struct llc_linkcb *, struct mbuf *, struct llc *, int, int,
		    int, int));
void cons_rtrequest __P((int, struct rtentry *, struct sockaddr *));
int x25_llcglue __P((int, struct sockaddr *));

#endif


